We, the undersigned, hereby express our agreement that the attached Schedule 13D is filed on behalf of each of us. Date: July 3, 1997 Wearnes Technology Pte. Ltd.

   1
                                    


         We, the undersigned, hereby express our agreement that the attached
Schedule 13D is filed on behalf of each of us.

Date:  July 3, 1997


                                  Wearnes Technology Pte. Ltd.


                                  By:      /s/ Xxxx Xxxx Xxx
                                  ---------------------------------------------
                                  Title:  Chairman


                                  WBL Corporation Limited


                                  By:      /s/ Xxxx Xxxx Xxx
                                  ---------------------------------------------
                                  Title:  Director


                                  Xxxx Xxxx Xxx


                                           /s/ Xxxx Xxxx Xxx
                                  ---------------------------------------------